Oper ating Instr u ctions CM Synchronous Ser v omotors 25 5 Electrical Inst allation VR forced cooling fan Upon request the synchronous servomotors c an be fitted with a VR forced cooling fan Mechanical inst all a tion The VR forced cooling fan is mounted on the nondrive end bearing shield using 4 holding fixtures U nscrew the machine screw 1 by 2 to 3 turns P osition the holding fixture 2 in the opening of the nondrive end bearing shield T ighten the machine screw 1 Note the tightening torque R epeat this mounting procedure for the other 3 holding fixtures A ttach the forced cooling fan to the mounted holding fixtures 51279AXX 1 2 Please always completely mount the holdin g fixture 2 on one machine screw 1 at a time else the encoder system settings might change Motor size T i ghtening torque Nm CM71 7 M5 CM90 13 M6 CM1 1 2 28 M8